Give the period of occurrence and any one characteristic signs/symptoms of the following disease:

a. Microsporidiosis in Tasar Silkworm

b. Muscardine in Muga Silkworm

c. Pebrine in Eri silkworm

d. Bacteriosis in Oak Tasar Silkworm

e. Grasserie in Eri Silkworm

a. Microsporidiosis in Tasar Silkworm:

Microsporidiosis is a significant disease that affects Tasar silkworms, also known as Antheraea mylitta. It is caused by the microsporidian parasite, Nosema antheraea. Microsporidiosis typically occurs during the late larval and pupal stages of Tasar silkworm development, which is usually between June and August in India. One characteristic sign/symptom of microsporidiosis in Tasar silkworms is a noticeable reduction in the size and weight of infected larvae. Healthy Tasar silkworm larvae are expected to reach a specific size before they start spinning their cocoons. However, infected larvae are often smaller, and they exhibit stunted growth compared to healthy counterparts. This stunted growth can result in lower silk production and economic losses for sericulture farmers. Additionally, infected larvae may also display sluggish and weak behavior, making them more susceptible to various stress factors and secondary infections.

b. Muscardine in Muga Silkworm:

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